CDC 2A652 Vol. 4

85 Questions | Total Attempts: 2458

SettingsSettingsSettings
Please wait...
2A652 Quizzes & Trivia

Aerospace Ground Equipment Journeyman Common AGE Systems. Edit Code 05.


Questions and Answers
  • 1. 
    What component on the New Generation Heater activates the HCU?
    • A. 

      Oil pressure switch.

    • B. 

      Burner control unit.

    • C. 

      Heat control switch.

    • D. 

      Thermostatic sensor.

  • 2. 
    The HCU on the New Generation heater starts the main air fan for output air when
    • A. 

      A heat setting is selected.

    • B. 

      Constant flame is established.

    • C. 

      The temperature gauge reads cool.

    • D. 

      The inside temperature reaches 140 degrees F.

  • 3. 
    When should you use starting aids to start the New Generation Heater?
    • A. 

      During the engine start up with the ignition switch in PREHEAT position.

    • B. 

      Never, as it will result in serious engine damage.

    • C. 

      When the temperature gauge reads COOL.

    • D. 

      When ambient temperature is below 32 degrees F.

  • 4. 
    Repair of ground heater equipment should never be attempted
    • A. 

      Without first talking with the operator.

    • B. 

      Without first consulting your supervisor.

    • C. 

      Unless accurate technical data is available.

    • D. 

      Unless in the presence of an experienced mechanic.

  • 5. 
    The amount of heat required to raise the temperature of one pound of a substance on degree Fahrenheit is known as
    • A. 

      British thermal unit.

    • B. 

      Sensible unit.

    • C. 

      Specific heat.

    • D. 

      Latent heat.

  • 6. 
    Heat that can be felt and added or subtracted to a substance without changing its state is called
    • A. 

      Super heat.

    • B. 

      Latent heat.

    • C. 

      Specific heat.

    • D. 

      Sensible heat.

  • 7. 
    Heat added to a gaseous substance is known as
    • A. 

      Sensible heat.

    • B. 

      Specific heat.

    • C. 

      Super heat.

    • D. 

      Latent heat.

  • 8. 
    The relationship between pressure and the boiling point of a liquid is seen when
    • A. 

      Pressure increases, it raises the boiling point.

    • B. 

      Pressure increases, it lowers the boiling point.

    • C. 

      The boiling point increases, it raises the pressure.

    • D. 

      The boiling point increases, it lowers the pressure.

  • 9. 
    The factors that have the greatest bearing on the temperature of a refrigerant are the boiling of a liquid and the amount of heat applied and the
    • A. 

      Temperature of the vapor.

    • B. 

      Type of heat transfer.

    • C. 

      Moisture in the air.

    • D. 

      Pressure applied.

  • 10. 
    What component on the MA-3D air conditioner allows the operator to control the overall volume of air leaving the unit?
    • A. 

      Blower control switch.

    • B. 

      Airflow control switch.

    • C. 

      Evaporator control switch.

    • D. 

      Temperature control switch.

  • 11. 
    What type of solution is used in the MA-3D aftercooler system to carry heat away from the conditioned air stream?
    • A. 

      Liquid refrigerant.

    • B. 

      Gaseous refrigerant.

    • C. 

      Pure water solution.

    • D. 

      Ethylene glycol/water solution.

  • 12. 
    Refrigerant that leaves the evaporator coil in the MA-3D air conditioner is further changed into a
    • A. 

      Low pressure gas.

    • B. 

      High pressure gas.

    • C. 

      Low pressure liquid.

    • D. 

      High pressure liquid.

  • 13. 
    After the refrigerant leaves the compressor on the MA-3D air conditioner, it passes through the oil separator and into the
    • A. 

      Heatsink coils.

    • B. 

      Condenser coils.

    • C. 

      Evaporator coils.

    • D. 

      Receiver inlet valve.

  • 14. 
    When starting the MA-3D air conditioner, hold the safety override switch until
    • A. 

      30 psi oil pressure is registered on the engine oil pressure gauge.

    • B. 

      You release the start switch.

    • C. 

      The engine warms up.

    • D. 

      The engine starts.

  • 15. 
    What component on the MA-3D air conditioner receives input from sensors for suction pressure and leaving air temperature?
    • A. 

      Air cooler fan.

    • B. 

      Air volume controller.

    • C. 

      Temperature controller.

    • D. 

      Temperature control knob.

  • 16. 
    What component on the MA-3D air conditioner shuts off the compressor when the suction  pressure drops below 5 psi?
    • A. 

      Low pressure cutout.

    • B. 

      High pressure cutout.

    • C. 

      Temperature controller.

    • D. 

      Temperature control switch.

  • 17. 
    What type of refrigeration system leak occurs when the pressure within the system is less than atmospheric pressure?
    • A. 

      Inward leaks.

    • B. 

      Vacuum leaks.

    • C. 

      Pressure leaks.

    • D. 

      Outward leaks.

  • 18. 
    When performing refrigerant recovery, be sure
    • A. 

      To use vacuum pumps.

    • B. 

      To use the HCU.

    • C. 

      The output air is between 150°F – 185°F.

    • D. 

      The refrigerant has become a low-pressure vapor for compressor use.

  • 19. 
    The air cycle machine of an A/M32C–10D air conditioner consists of
    • A. 

      A air compressor fan only.

    • B. 

      An expansion turbine only.

    • C. 

      A heat exchanger and an expansion turbine.

    • D. 

      An expansion turbine and a compressor fan.

  • 20. 
    The component of a A/M32C–10D air conditioner that extracts energy from the bleed air on the air cycle machine is the
    • A. 

      Compressor.

    • B. 

      Heat exchanger.

    • C. 

      Expansion turbine.

    • D. 

      Temperature controller.

  • 21. 
    The compressor switch on the ACE 802S must be held in the HOLD position when engaging the compressor in order to
    • A. 

      Ensure the engine is at governed speed before engaging compressor.

    • B. 

      Allow the oil and discharge pressures to stabilize.

    • C. 

      Defrost the evaporator.

    • D. 

      Build-up oil pressure.

  • 22. 
    What action occurs in the evaporator of the ACE 802S air conditioner?
    • A. 

      Condensing refrigerant absorbs heat from the air stream.

    • B. 

      Boiling refrigerant absorbs heat from the air stream.

    • C. 

      Condensing refrigerant looses heat to the air stream.

    • D. 

      Boiling refrigerant looses heat to the air stream.

  • 23. 
    What system on the ACE 802S air conditioner “supercharges” the compressor?
    • A. 

      Defrost.

    • B. 

      Heat boost.

    • C. 

      Vapor injection.

    • D. 

      Liquid injection.

  • 24. 
    What valve must be opened prior to starting the engine on the ACE 802S?
    • A. 

      Air shutoff.

    • B. 

      Fuel shutoff.

    • C. 

      Coolant control.

    • D. 

      Refrigerant flow.

  • 25. 
    What must be accomplished to avoid damage prior to operating the ACE 802S air conditioner in the HEATING mode after COOLING mode operation?
    • A. 

      Permit refrigerant pressure to equalize.

    • B. 

      Perform maximum refrigerant pump down.

    • C. 

      Place heating/cooling switch in HEATING position.

    • D. 

      Place the reversing valve lever in the HEATING position.